CC Content Server - do not display User Categories

I would like to disable some of the groups displayed when looking at the content server from my device. In particular, I don't want the User Categories to be displayed because they are not displayed nested as are the tags.

Example:

The Index of content server displays as follows:

By Newest
By Title
By Author Awards.Crime Writer's Association Ian Fleming Steel Dagger Award
By Author Awards.Edgar Award
By Author Awards.Gold Dagger for Fiction
By Author Awards.Hugo Award
etc.
By Author Country.Canada
By Author Country.Denmark
etc.

My User Categories are Author Awards and Author Countries and I would rather these either not appear at all, or appear nested the way tags do.

Is there a way around this?